Move the trace-event-parse.c code that originally came from trace-cmd intotheir own files. The new file will be called trace-parse-events.c, asthe name of trace-cmd's file was parse-events.c too, but it conflictedwith the parse-events.c file in perf that parses the command line.

This tries to update the code with mimimal changes.

Perf specific code stays in the trace-event-parse.[ch] files andthe common parsing code is now in trace-parse-events.c andtrace-parse-events.h.